doc: keep sidebar module visible when navigating docs

PR-URL: https://github.com/nodejs/node/pull/60410
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

doc/api_assets/api.js

@@ -187,6 +187,20 @@
     });
   }
 
+  function setupSidebarScroll() {
+    const sidebarLinks = document.querySelectorAll('#column2 a');
+
+    let link;
+    for (link of sidebarLinks) {
+      if (link.pathname === window.location.pathname) break;
+    }
+
+    if (!link) return;
+
+    link.scrollIntoView({ block: 'center' });
+  }
+
+
   function bootstrap() {
     // Check if we have JavaScript support.
     document.documentElement.classList.add('has-js');
@@ -206,6 +220,8 @@
     setupFlavorToggles();
 
     setupCopyButton();
+
+    setupSidebarScroll();
   }
 
   if (document.readyState === 'loading') {